Micro-arc spot welding process for secondary coil terminal lug

Abstract

The invention relates to a micro-arc spot welding process for the secondary coil terminal lug of an ignition coil, comprising the two steps of removing oxidation layer and micro-arc spot welding. Firstly, the winding position of the secondary coil terminal lug is polished by a fine emery paper; subsequently, the micro-arc spot welding is carried out at the winding position according to the setup parameters and the operation standard so as to lead the melted metal to form a solder joint ball, thus covering the secondary winding end at the winding position of the secondary coil terminal lug; and after arc-extinguishing, the argon is postponed to be closed for 0.5 seconds so as to protect the cooling and solidification of the solder joint ball. Compared with the general electric soldering iron welding process, the micro-arc welding process has the advantages of containing no lead, environment protection, having no harm to human, high spot welding efficiency, smooth solder joint ball, covering the secondary winding end at the winding position of the secondary coil terminal lug, thus preventing point discharge and improving the durability of the ignition coil.

Description

technical field

[0001] The invention relates to a welding process, in particular to a micro-arc spot welding process for a secondary coil lug of an ignition coil. Background technique

[0002] The welding of the secondary coil lugs of the ignition coil usually adopts the soldering iron welding process. Before soldering, first remove the oxide layer on the lug, polish it with fine sandpaper and apply a layer of solder paste; secondly, use a tinned thermoelectric soldering iron tip to tin-plate the lug. When soldering, the angle between the soldering iron and the horizontal plane is 60°, so that the molten tin flows from the tip of the soldering iron to the lug, and the soldering time is 1 to 3 seconds. After soldering, the position of the lug remains unchanged until the tin at the solder joint is cooled and solidified. Soldering with an electric soldering iron is a manual operation. There is lead in the solder, and the solder paste is corrosive to a certain extent. The sold...